stoping a puppy from chewing.

I wouldn't be too worried about your cat, I'm sure Jessy can take care himself/herself and will give Raven a swat when he starts biting too hard. It's actually very impressive if your puppy has learned that if he wants to bite Jessy, he has to do it softly - which is great! It's good for puppies to learn what is appropriate biting strength when playing with other animals. If you ever get a chance to watch puppies play, one moment they'll be playing and the next one will yelp and stop playing because the other will be too rough. It's all part of growing up! As for the overall chewing situation, I wouldn't see it as a problem because puppies teeth and will they chew because it helps them with the pain. Just make sure you have toys for your puppy to chew on. If he starts biting you, make a loud terrifying noise to startle the puppy so he knows you DO NOT like being it and it's not okay. Turn away and ignore him for a bit and then come back offering him a toy to chew on instead. Right now is the best time to teach him that you only want him to bite on his toys and when he does, make sure to praise him and use the toys to play with him. Never let him chew on you or anyone else because it's harder to unteach a behavior than it is to teach one. And the most important suggestion of all is CONSISTENCY. This will show your dog EXACTLY what you allow and don't allow. Raven will quickly learn you mean business and wont praise him if he chews on you, instead, you will make an awful noise and ignore him. Also, when you praise him, do so lavishly so it seems like an AWESOME reward. Good luck!

By far your best solution is the squirt bottle. Every time he chews the cat's ears use it. Eventually he will associate this unpleaantness with the chewing and it will cease. Furthermore your cat will probably begin to respond to the squirt bottle also and will go away from the dog when it get squirted. It should work. As for normal chewing, try to "puppy proof" your house. Get dangerous things out of the way, pick up shoes etc. And firmly "growl" at him when he is chewing something you do not want him to touch. And replace it with a toy so that he knows the difference. Play with him with his toys so that they will know that is ok to chew and tug on them.

well look for toys or stuff that he can chew, that always work for me. and i think your dog is "teething" this will eventually pass but stop him when you don't want it to get chewed

Try a squirt bottle. I have two Boston's and when they were in training (before they would just listen to my voice) I would use a squirt bottle. When ever the dog is doing something you do not want, squirt the dog and tell him/her no. You will be surprised how effective a squirt bottle is.